Buggy code:
public class TestIndexReaderReopen extends LuceneTestCase { private File indexDir ; public void testReopen ( ) throws Exception { } public void testParallelReaderReopen ( ) throws Exception { } public void testCommitReopenFS ( ) throws IOException { } public void testCommitRecreateFS ( ) throws IOException { } public void testCommitReopenRAM ( ) throws IOException { } public void testCommitRecreateRAM ( ) throws IOException { } private void doTestReopenWithCommit ( Directory dir , boolean withReopen ) throws IOException { } public void testMultiReaderReopen ( ) throws Exception { } public void testMixedReaders ( ) throws Exception { } private void performDefaultTests ( TestIndexReaderReopen . TestReopen test ) throws Exception { } public void testReferenceCounting ( ) throws IOException { } public void testReferenceCountingMultiReader ( ) throws IOException { } public void testReferenceCountingParallelReader ( ) throws IOException { } public void testNormsRefCounting ( ) throws IOException { } private void performTestsWithExceptionInReopen ( TestIndexReaderReopen . TestReopen test ) throws Exception { } public void testThreadSafety ( ) throws Exception { } private static class ReaderCouple { ReaderCouple ( IndexReader r1 , IndexReader r2 ) { } IndexReader newReader ; IndexReader refreshedReader ; } private abstract static class ReaderThreadTask { protected boolean stopped ; public void stop ( ) { } public abstract void run ( ) throws Exception { } } private static class ReaderThread extends Thread { private TestIndexReaderReopen . ReaderThreadTask task ; private Throwable error ; ReaderThread ( TestIndexReaderReopen . ReaderThreadTask task ) { } public void stopThread ( ) { } public void run ( ) { } } private Object createReaderMutex = new Object ( ) ; private TestIndexReaderReopen . ReaderCouple refreshReader ( IndexReader reader , boolean hasChanges ) throws IOException { } private TestIndexReaderReopen . ReaderCouple refreshReader ( IndexReader reader , TestIndexReaderReopen . TestReopen test , int modify , boolean hasChanges ) throws IOException { } private static void createIndex ( Directory dir , boolean multiSegment ) throws IOException { } private static Document createDocument ( int n , int numFields ) { } private static void modifyIndex ( int i , Directory dir ) throws IOException { } private void assertReaderClosed ( IndexReader reader , boolean checkSubReaders , boolean checkNormsClosed ) { } private void assertReaderOpen ( IndexReader reader ) { } private void assertRefCountEquals ( int refCount , IndexReader reader ) { } private abstract static class TestReopen { protected abstract IndexReader openReader ( ) throws IOException { } protected abstract void modifyIndex ( int i ) throws IOException { } } protected void setUp ( ) throws Exception { } public void testFSDirectoryReopen ( ) throws IOException , CorruptIndexException { } public void testFSDirectoryReopen2 ( ) throws IOException , CorruptIndexException { String tempDir = System . getProperty ( "java.io.tmpdir" ) ; if ( tempDir == null ) throw new IOException ( "java.io.tmpdir<seq2seq4repair_space>undefined,<seq2seq4repair_space>cannot<seq2seq4repair_space>run<seq2seq4repair_space>test" ) ; File indexDir2 = new File ( tempDir , "IndexReaderReopen2" ) ; Directory dir1 = FSDirectory . getDirectory ( indexDir2 ) ; TestIndexReaderReopen . createIndex ( dir1 , false ) ; IndexReader lastReader = IndexReader . open ( indexDir2 ) ; Random r = new Random ( 42 ) ; for ( int i = 0 ; i < 10 ; i ++ ) { int mod = r . nextInt ( 5 ) ; TestIndexReaderReopen . modifyIndex ( mod , lastReader . directory ( ) ) ; IndexReader reader = lastReader . reopen ( ) ; if ( reader != lastReader ) { lastReader . close ( ) ; lastReader = reader ; } } lastReader . close ( ) ; dir1 . close ( ) ; try { <START_BUG> dir1 . list ( ) ; <END_BUG> fail ( "did<seq2seq4repair_space>not<seq2seq4repair_space>hit<seq2seq4repair_space>AlreadyClosedException" ) ; } catch ( AlreadyClosedException ace ) { } } }

Fix:
dir1 . listAll ( ) ;